Filmmaker Michael Moore told the crowd assembled for the Women’s March on Washington Saturday morning that they should make their top priority opposing the confirmation of President Trump’s nominee to run the Education Department, Betsy DeVos.

“On Monday, call (202) 225-3121. Call your representative and your two Senators, and number one we do not accept Betty DeVos as our secretary of education,” Moore said. “That’s day one. Make it part of your daily routine.”

After a highly contentious Senate confirmation hearing Tuesday, during which she displayed a lack of understanding of basic education issues, DeVos is facing growing opposition to her nomination as President Trump’s education secretary — including from groups that largely support the same issues she does. And now she will have to wait longer than expected for the Senate education committee to decide on her confirmation: Shortly after her ethics review was made public Friday, Sen. Lamar Alexander (R-Tenn.), moved the vote back one week amid calls from Democrats for more time to vet her.